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Unit 3.3

Electric Current The flow of electrons through a wire or other conductor.
Direct Current the flow of electrons directly along a path from the negative to the positive terminal. Can only flow in one direction.
Alternating Current an electric current where the flow of electrons rapidly reverses itself.
Rectifier converts alternating current (AC) into direct current (DC).
Battery a device that produces electrical energy from a chemical reaction involving two dissimilar metals, such as zinc and copper.
Alessandro Volta credited with inventing the first battery in 1800, and Napoleon made Volta a Count soon afterwards.
Wet Cell Batteries consists of two strips of dissimilar metals sitting in an acid bath. The two metal strips are commonly made of zinc and copper and sit in a solution of sulfuric acid.
Electrodes The dry ends of the metal strips in batteries
Cathode The electrode with the greatest number of electrons and forms the negative terminal of a battery.
Anode the electrode with less electrons
Voltage The difference in electrical pressure in a battery.
Dry cell battery the chemical reaction between metals and acid takes place in a paste rather than a liquid.
Created by: BHS Engineering
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